I'm just setting up and have added my Netatmo system including rain gauge to Smartthings.
All measurements I get correct from the base station and outdoor module in the SmartThings App and AT.
From the rain sensor, not so much. I get a battery reading, but nothing on rain.
The app displays all correct, Battery, Rain, sumHours, SumDay, units and last update.,
Customer support service by UserEcho